TY JOUR TI The structure of caustics beletsky equation KW scheme Lyapunov-Schmidt KW a key function KW caustic. JO Actual directions of scientific researches of the XXI century: theory and practice AU Kostina, T.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov